Measurement of inclusive and dijet D ∗ meson cross sections in photoproduction at HERA

F.D. Aaron; C. Alexa; V. Andreev; S. Backovic; A. Baghdasaryan; S. Baghdasaryan; E. Barrelet; W. Bartel; K. Begzsuren; A. Belousov; P. Belov; J.C. Bizot; M.-O. Boenig; V. Boudry; I. Bozovic-Jelisavcic; J. Bracinik; G. Brandt; M. Brinkmann; V. Brisson; D. Britzger; D. Bruncko; A. Bunyatyan; G. Buschhorn; L. Bystritskaya; A.J. Campbell; K.B. Cantun Avila; F. Ceccopieri; K. Cerny; V. Cerny; V. Chekelian; J.G. Contreras; J.A. Coughlan; J. Cvach; J.B. Dainton; K. Daum; B. Delcourt; J. Delvax; E.A. Wolf; C. Diaconu; M. Dobre; V. Dodonov; A. Dossanov; A. Dubak; G. Eckerlin; S. Egli; A. Eliseev; E. Elsen; L. Favart; A. Fedotov; R. Felst; J. Feltesse; J. Ferencei; D.-J. Fischer; M. Fleischer; A. Fomenko; E. Gabathuler; J. Gayler; S. Ghazaryan; A. Glazov; L. Goerlich; N. Gogitidze; M. Gouzevitch; C. Grab; A. Grebenyuk; T. Greenshaw; G. Grindhammer; S. Habib; D. Haidt; C. Helebrant; R.C.W. Henderson; E. Hennekemper; H. Henschel; M. Herbst; G. Herrera; M. Hildebrandt; K.H. Hiller; D. Hoffmann; R. Horisberger; T. Hreus; F. Huber; M. Jacquet; X. Janssen; L. Jönsson; A.W. Jung; H. Jung; M. Kapichine; I.R. Kenyon; C. Kiesling; M. Klein; C. Kleinwort; T. Kluge; R. Kogler; P. Kostka; M. Krämer; J. Kretzschmar; K. Krüger; M.P.J. Landon; W. Lange; G. Laštovička-Medin; P. Laycock; A. Lebedev; V. Lendermann; S. Levonian; K. Lipka; B. List; J. List; R. Lopez-Fernandez; V. Lubimov; A. Makankine; E. Malinovski; H.-U. Martyn; S.J. Maxfield; A. Mehta; A.B. Meyer; H. Meyer; J. Meyer; S. Mikocki; I. Milcewicz-Mika; F. Moreau; A. Morozov; J.V. Morris; M. Mudrinic; K. Müller; Th. Naumann; P.R. Newman; C. Niebuhr; D. Nikitin; G. Nowak; K. Nowak; J.E. Olsson; D. Ozerov; P. Pahl; V. Palichik; I. Panagoulias; M. Pandurovic; Th. Papadopoulou; C. Pascaud; G.D. Patel; E. Perez; A. Petrukhin; I. Picuric; S. Piec; H. Pirumov; D. Pitzl; R. Plačakytė; B. Pokorny; R. Polifka; B. Povh; V. Radescu; N. Raicevic; T. Ravdandorj; P. Reimer; E. Rizvi; P. Robmann; R. Roosen; A. Rostovtsev; M. Rotaru; J.E. Ruiz Tabasco; S. Rusakov; D. Šálek; D.P.C. Sankey; M. Sauter; E. Sauvan; S. Schmitt; L. Schoeffel; A. Schöning; H.-C. Schultz-Coulon; F. Sefkow; L.N. Shtarkov; S. Shushkevich; T. Sloan; I. Smiljanic; Y. Soloviev; P. Sopicki; D. South; V. Spaskov; A. Specka; Z. Staykova; M. Steder; B. Stella; G. Stoicea; U. Straumann; T. Sykora; P.D. Thompson; T.H. Tran; D. Traynor; P. Truöl; I. Tsakov; B. Tseepeldorj; J. Turnau; K. Urban; A. Valkárová; C. Vallée; P. Mechelen; Y. Vazdik; D. Wegener; E. Wünsch; J. Žáček; J. Zálešák; Z. Zhang; A. Zhokin; H. Zohrabyan; F. Zomer

doi:10.1140/epjc/s10052-012-1995-0

2021 Impact factor 4.991

Particles and Fields

Open Access

Eur. Phys. J. C (2012) 72: 1995
https://doi.org/10.1140/epjc/s10052-012-1995-0

Regular Article - Experimental Physics

Measurement of inclusive and dijet D ^∗ meson cross sections in photoproduction at HERA

H1 Collaboration
F.D. Aaron⁶, C. Alexa⁶, V. Andreev²⁶, S. Backovic³¹, A. Baghdasaryan³⁹, S. Baghdasaryan³⁹, E. Barrelet³⁰, W. Bartel¹², K. Begzsuren³⁶, A. Belousov²⁶, P. Belov¹², J.C. Bizot²⁸, M.-O. Boenig⁹, V. Boudry²⁹, I. Bozovic-Jelisavcic², J. Bracinik³, G. Brandt¹², M. Brinkmann¹², V. Brisson²⁸, D. Britzger¹², D. Bruncko¹⁷, A. Bunyatyan¹⁴^,39, G. Buschhorn²⁷, L. Bystritskaya²⁵, A.J. Campbell¹², K.B. Cantun Avila²³, F. Ceccopieri⁴^,5, K. Cerny³³, V. Cerny¹⁷, V. Chekelian²⁷, J.G. Contreras²³, J.A. Coughlan⁷, J. Cvach³², J.B. Dainton¹⁹, K. Daum³⁸^*, B. Delcourt²⁸, J. Delvax⁴^,5, E.A. Wolf⁴^,5, C. Diaconu²², M. Dobre¹³, V. Dodonov¹⁴, A. Dossanov²⁷, A. Dubak³¹, G. Eckerlin¹², S. Egli³⁷, A. Eliseev²⁶, E. Elsen¹², L. Favart⁴^,5, A. Fedotov²⁵, R. Felst¹², J. Feltesse¹¹, J. Ferencei¹⁷, D.-J. Fischer¹², M. Fleischer¹², A. Fomenko²⁶, E. Gabathuler¹⁹, J. Gayler¹², S. Ghazaryan¹², A. Glazov¹², L. Goerlich⁸, N. Gogitidze²⁶, M. Gouzevitch¹², C. Grab⁴¹, A. Grebenyuk¹², T. Greenshaw¹⁹, G. Grindhammer²⁷, S. Habib¹², D. Haidt¹², C. Helebrant¹², R.C.W. Henderson¹⁸, E. Hennekemper¹⁶, H. Henschel⁴⁰, M. Herbst¹⁶, G. Herrera²⁴, M. Hildebrandt³⁷, K.H. Hiller⁴⁰, D. Hoffmann²², R. Horisberger³⁷, T. Hreus⁴^,5, F. Huber¹⁵, M. Jacquet²⁸, X. Janssen⁴^,5, L. Jönsson²¹, A.W. Jung¹⁶, H. Jung¹²^,4^,5, M. Kapichine¹⁰, I.R. Kenyon³, C. Kiesling²⁷, M. Klein¹⁹, C. Kleinwort¹², T. Kluge¹⁹, R. Kogler¹², P. Kostka⁴⁰, M. Krämer¹², J. Kretzschmar¹⁹, K. Krüger¹⁶, M.P.J. Landon²⁰, W. Lange⁴⁰, G. Laštovička-Medin³¹, P. Laycock¹⁹, A. Lebedev²⁶, V. Lendermann¹⁶, S. Levonian¹², K. Lipka¹², B. List¹², J. List¹², R. Lopez-Fernandez²⁴, V. Lubimov²⁵, A. Makankine¹⁰, E. Malinovski²⁶, H.-U. Martyn¹, S.J. Maxfield¹⁹, A. Mehta¹⁹, A.B. Meyer¹², H. Meyer³⁸, J. Meyer¹², S. Mikocki⁸, I. Milcewicz-Mika⁸, F. Moreau²⁹, A. Morozov¹⁰, J.V. Morris⁷, M. Mudrinic², K. Müller⁴², Th. Naumann⁴⁰, P.R. Newman³, C. Niebuhr¹², D. Nikitin¹⁰, G. Nowak⁸, K. Nowak¹², J.E. Olsson¹², D. Ozerov²⁵, P. Pahl¹², V. Palichik¹⁰, I. Panagoulias¹², M. Pandurovic², Th. Papadopoulou¹², C. Pascaud²⁸, G.D. Patel¹⁹, E. Perez¹¹, A. Petrukhin¹², I. Picuric³¹, S. Piec¹², H. Pirumov¹⁵, D. Pitzl¹², R. Plačakytė¹², B. Pokorny³³, R. Polifka³³, B. Povh¹⁴, V. Radescu¹², N. Raicevic³¹, T. Ravdandorj³⁶, P. Reimer³², E. Rizvi²⁰, P. Robmann⁴², R. Roosen⁴^,5, A. Rostovtsev²⁵, M. Rotaru⁶, J.E. Ruiz Tabasco²³, S. Rusakov²⁶, D. Šálek³³, D.P.C. Sankey⁷, M. Sauter¹⁵, E. Sauvan²², S. Schmitt¹², L. Schoeffel¹¹, A. Schöning¹⁵, H.-C. Schultz-Coulon¹⁶, F. Sefkow¹², L.N. Shtarkov²⁶, S. Shushkevich¹², T. Sloan¹⁸, I. Smiljanic², Y. Soloviev²⁶, P. Sopicki⁸, D. South¹², V. Spaskov¹⁰, A. Specka²⁹, Z. Staykova⁴^,5, M. Steder¹², B. Stella³⁴, G. Stoicea⁶, U. Straumann⁴², T. Sykora³³^,4^,5, P.D. Thompson³, T.H. Tran²⁸, D. Traynor²⁰, P. Truöl⁴², I. Tsakov³⁵, B. Tseepeldorj³⁶, J. Turnau⁸, K. Urban¹⁶, A. Valkárová³³, C. Vallée²², P. Mechelen⁴^,5, Y. Vazdik²⁶, D. Wegener⁹, E. Wünsch¹², J. Žáček³³, J. Zálešák³², Z. Zhang²⁸, A. Zhokin²⁵, H. Zohrabyan³⁹ and F. Zomer²⁸

¹ I. Physikalisches Institut der RWTH, Aachen, Germany
² Vinca Institute of Nuclear Sciences, University of Belgrade, 1100, Belgrade, Serbia
³ School of Physics and Astronomy, University of Birmingham, Birmingham, UK
⁴ Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
⁵ Universiteit Antwerpen, Antwerpen, Belgium
⁶ National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
⁷ Rutherford Appleton Laboratory, Chilton, Didcot, UK
⁸ Institute for Nuclear Physics, Cracow, Poland
⁹ Institut für Physik, TU Dortmund, Dortmund, Germany
¹⁰ Joint Institute for Nuclear Research, Dubna, Russia
¹¹ CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
¹² DESY, Hamburg, Germany
¹³ Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
¹⁴ Max-Planck-Institut für Kernphysik, Heidelberg, Germany
¹⁵ Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
¹⁶ Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
¹⁷ Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
¹⁸ Department of Physics, University of Lancaster, Lancaster, UK
¹⁹ Department of Physics, University of Liverpool, Liverpool, UK
²⁰ School of Physics and Astronomy, Queen Mary, University of London, London, UK
²¹ Physics Department, University of Lund, Lund, Sweden
²² CPPM, Aix-Marseille Univ, CNRS/IN2P3, 13288, Marseille, France
²³ Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, México
²⁴ Departamento de Fisica, CINVESTAV IPN, México City, México
²⁵ Institute for Theoretical and Experimental Physics, Moscow, Russia
²⁶ Lebedev Physical Institute, Moscow, Russia
²⁷ Max-Planck-Institut für Physik, München, Germany
²⁸ LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
²⁹ LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
³⁰ LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, Paris, France
³¹ Faculty of Science, University of Montenegro, Podgorica, Montenegro
³² Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
³³ Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
³⁴ Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, Italy
³⁵ Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
³⁶ Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
³⁷ Paul Scherrer Institut, Villigen, Switzerland
³⁸ Fachbereich C, Universität Wuppertal, Wuppertal, Germany
³⁹ Yerevan Physics Institute, Yerevan, Armenia
⁴⁰ DESY, Zeuthen, Germany
⁴¹ Institut für Teilchenphysik, ETH, Zürich, Switzerland
⁴² Physik-Institut der Universität Zürich, Zürich, Switzerland

^* e-mail: daum@mail.desy.de

Received: 6 March 2012
Revised: 12 April 2012
Published online: 4 May 2012

Abstract

The inclusive photoproduction of D ^∗ mesons and of D ^∗-tagged dijets is investigated with the H1 detector at the ep collider HERA. The kinematic region covers small photon virtualities Q ²<2 GeV² and photon–proton centre-of-mass energies of 100<W _γp<285 GeV. Inclusive D ^∗ meson differential cross sections are measured for central rapidities |η(D ^∗)|<1.5 and transverse momenta p _T(D ^∗)>1.8 GeV. The heavy quark production process is further investigated in events with at least two jets with transverse momentum p _T(jet)>3.5 GeV each, one containing the D ^∗ meson. Differential cross sections for D ^∗-tagged dijet production and for correlations between the jets are measured in the range |η(D ^∗)|<1.5 and p _T(D ^∗)>2.1 GeV. The results are compared with predictions from Monte Carlo simulations and next-to-leading order perturbative QCD calculations.